GOST 33296-2015 PDF

Full title and description

ГОСТ 33296-2015 — Межгосударственный стандарт: "Топлива остаточные. Определение прямогонности. Метод определения толуольного эквивалента" (Residual fuel oils. Test for straight-run. Method for determination of toluene equivalent). The standard defines a laboratory test to determine the toluene equivalent of residual fuel oils (including samples containing components insoluble in toluene).

Abstract

This standard specifies a comparative, filter‑based procedure for estimating the toluene equivalent of residual fuel oils on a 0–100 scale. The method covers samples with components soluble and insoluble in toluene and can be applied to vacuum residues; it uses graded mixtures of toluene and n‑heptane, filtration where necessary, and visual evaluation of spot/ring patterns on filters to determine the toluene equivalent.

General information

• Status: Active (introduced as an interstate standard and adopted as a national standard of the Russian Federation for voluntary application).
• Publication date: Standard designation year 2015; adopted by Rosstandart by Order No. 1263‑ст dated 31 August 2015 and put into effect from 1 January 2017.
• Publisher: Developed under the Interstate Technical Committee MTK 31 ("Oil fuels and lubricants"), submitted by the Federal Agency on Technical Regulating and Metrology (Rosstandart); published (printed edition source) — Standartinform, Moscow (2016).
• ICS / categories: ICS 75.160.20 (liquid fuel).
• Edition / version: ГОСТ 33296‑2015 — first introduction (2015 designation; effective from 01 January 2017).
• Number of pages: 8 pages (typical published text length in official/electronic libraries).

Scope

The standard establishes the method for determining the toluene equivalent of residual fuel oils in the range 0–100, including fuels that contain components insoluble in toluene. The procedure is suitable for the study of vacuum residues and specifies sample preparation, required apparatus and reagents, filtration for insoluble components, preparation of toluene/n‑heptane mixtures of graded concentrations, application of sample drops onto filters, and visual assessment of spot/ring morphology to derive the toluene equivalent.

Key topics and requirements

• Definition of "toluene equivalent" as the average volumetric fraction of toluene between two reference solutions producing characteristic filter‑spot ring patterns.
• Applicable range: toluene equivalent scale from 0 to 100; method applicable to samples with both toluene‑soluble and toluene‑insoluble components.
• Required apparatus and reagents: ultrasonic bath, boiling water bath, Millipore membrane filters (5 µm, 47 mm), burettes, micro‑burettes, n‑heptane (standard), toluene (specified grade), vacuum filtration equipment, glassware.
• Procedure essentials: dissolve sample in graded toluene/n‑heptane mixtures, sonication and heating steps, filtration of insoluble matter before final solutions, deposit drops onto filters, inspect ring/spot morphology to select the concentration giving the characteristic ring and calculate final toluene equivalent.
• Sample handling and sampling references: sampling per applicable standards (e.g., referenced national GOST sampling standards) to ensure representative test material.
• Designed as a comparative/visual laboratory test — results depend on controlled procedure and operator judgement; follow specified steps for reproducibility.

Typical use and users

Used by petrochemical and fuel testing laboratories, refinery quality control departments, research institutes dealing with heavy and residual fuels (the standard was prepared with participation of the All‑Russian Research Institute for Oil Refining), marine bunker fuel testers, and regulatory or certifying bodies that evaluate properties of residual fuels. The test is particularly useful when assessing straight‑run character and relative solvency properties of vacuum residues and heavy fuel blends.

Related standards

This standard is part of a set of methods for residual fuel oils. It was developed on the basis of ГОСТ R 50837.3‑95 and references other neighboring standards such as ГОСТ 33360‑2015 (method for determination of total sediment) and related residual‑fuel standards (for example ГОСТ 33298‑2015 on flocculation assessment). Users should consult referenced sampling and reagent standards cited in the normative references of the text.

Keywords

residual fuel oil; toluene equivalent; straight‑run test; vacuum residue; asphaltenes; sediment; n‑heptane; Millipore filter; fuel quality testing; ГОСТ 33296‑2015.

FAQ

Q: What is this standard?

A: ГОСТ 33296‑2015 is an interstate/national standard that specifies a laboratory method to determine the toluene equivalent of residual fuel oils (a comparative visual test based on toluene/n‑heptane mixtures and filter spot morphology).

Q: What does it cover?

A: It covers sample preparation, required apparatus and reagents, testing procedure (including filtration of insolubles), and result interpretation for toluene equivalent values from 0 to 100; it is applicable to residual fuel oils and vacuum residues containing components insoluble in toluene.

Q: Who typically uses it?

A: Petrochemical and fuel testing laboratories, refinery QC departments, research institutes (including developers who participated in preparation), marine fuel testers, and regulatory/certification bodies concerned with residual fuel properties.

Q: Is it current or superseded?

A: As of its adoption, ГОСТ 33296‑2015 was introduced by Rosstandart Order No. 1263‑ст (31 August 2015) and came into effect on 1 January 2017; sources list it as active (in force) and introduced for the first time. Users should check the official national/intrastate registries for any later amendments or replacements.

Q: Is it part of a series?

A: Yes — it belongs to a collection of standards for residual fuel oils and references related methods (e.g., methods for total sediment, flocculation/flake formation). It was prepared under MTK 31 ("Oil fuels and lubricants") and is linked to earlier national methods (for example ГОСТ R 50837.3‑95).

Q: What are the key keywords?

A: Toluene equivalent; residual fuel; straight‑run test; vacuum residue; filter spot; asphaltenes; n‑heptane; fuel quality.